<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title></title>
</head>
<body>

<p id="demo">单击按钮创建文本节点。</p>
<button onclick="myFunction()">点我</button>
<script>
  function myFunction(){
    var t=document.createTextNode("Hello World");
    t.textContent = 123;
    document.body.appendChild(t);
  };

</script>

</body>
</html>
